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I'll keep it short and sweet

It's blowing the Bowden tube off the extruder, how can I fix that?

The Hotend is not plugged and the Bowden is fully seated on both ends and has enough slack.

Probably too obvious but is your pushfitting working? Maybe replace it?
Has this bondtech been working okay before, or is it a new install? Maybe it is pushing much to hard, or trying much too quickly. I hear bondtechs have a lot of strength and grip on the filament, so it might be strong enough to overcome to strength of a pushfitting if pushing too quickly for the hotend to melt the filament. So check your steps/mm and the extrusion speed.

DeltaCon wrote:Probably too obvious but is your pushfitting working? Maybe replace it?
Has this bondtech been working okay before, or is it a new install? Maybe it is pushing much to hard, or trying much too quickly. I hear bondtechs have a lot of strength and grip on the filament, so it might be strong enough to overcome to strength of a pushfitting if pushing too quickly for the hotend to melt the filament. So check your steps/mm and the extrusion speed.

The Bondtech has been sitting in a box waiting go onto a mother printer build and I decided to put it on my RMv2 upgrade project it looks like the push fitting is working. Extrusion speed is slow and steps/mm is right where Bondtech says it should be.

Which hot end? If an HE280 you'd be amazed at how much force is generated by that "plug" that can form at the bottom of the PTFE.

The PTC fittings do crimp the PTFE tube so sometimes cutting 5mm off the end of the tube repositions the clamping to a good area.

Do you have the "lobster claw" lock installed? That also secures the tube more tightly.

Yes its the HE280, fresh ends on the PTFE tubing I'll try the lobster claws